Fix Firefox's bloated UX

userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

/* Prevent massive mega url bar */
#urlbar[breakout],
#urlbar[breakout][breakout-extend] {
  width: 100% !important;
  top: calc((var(--urlbar-container-height) - var(--urlbar-height)) / 2) !important;
  left: 0 !important;
}

#urlbar[breakout][breakout-extend] > #urlbar-input-container,
#urlbar-input-container {
  height: var(--urlbar-height) !important;
  width: 100% !important;
  padding-block: unset !important;
  padding-inline: unset !important;
  transition: none !important;
}

#urlbar[breakout][breakout-extend] > #urlbar-background {
  box-shadow: 0 1px 4px rgba(0,0,0,.05) !important;
  animation: none !important;
}

/*** Prevent massively padded, forever elongated bookmark toolbar menu items (pre FF92 style menu items) ***/
menupopup > menuitem, menupopup > menu {
  padding-block: 4px !important;
  max-width: 20em !important;
}
:root {
  --arrowpanel-menuitem-padding: 4px 8px !important;
}

mega-bar style fix:

• regular url bar
  
• cursor in url bar
  
• typing in url bar
  

menu padding / spacing fix:

• before (FF 92+ style):
  
• after (pre FF 92 style):
  

File Location:

userChrome.css file path:

• mac: /Users/<user>/Library/Application Support/Firefox/Profiles/<profile>/chrome/userChrome.css
• win: %appdata%\Mozilla\Firefox\Profiles\<profile>\chrome\userChrome.css
• linux: ~/.mozilla/firefox/<profile>/chrome/userChrome.css

If the file or chrome folder doesn't exist, create the chrome folder, then create the userChrome.css file inside it and add the above contents, save and restart Firefox.

I had to change --urlbar-toolbar-height to --urlbar-container-height in FF126, otherwise the urlbar search suggestions box moved way up so that its top part wasn't even visible.

I had to change --urlbar-toolbar-height to --urlbar-container-height in FF126, otherwise the urlbar search suggestions box moved way up so that its top part wasn't even visible.

Cheers for that. It was on my list of todo's to investigate as I'd noticed that it changed just recently!